In my experience at least, UGF's are not low-maintenance in planted or heavily stocked tanks. Waste/mulm may accumulate beneath the plate more rapidly than the bacteria consume it, eventually becoming anoxic sludge; once this happens you have to tear apart your aquascaping to clean it. I would definitely go with a sump over a UGF. Besides ease of maintenance, another advantage is that you can include a macroalgae-planted refugium, reducing algal growth in the main tank.
If you're going for a planted biotope, the easiest options are Amazon, South/Southeast Asian, and East/Central North American; fewer plants are available from other parts of the world. There are plenty of gorgeous community fish from each region.
The Amazon has tetras, hatchets, silver dollars, plecos, otos, cories, numerous other cats, etc.
Southeast Asia has rasboras, barbs, danios, gouramis, loaches, glassfish, and cats such as Mystus and glass cats.
North America has darters, shiners, dace, madtoms, mollies, killifish, pygmy sunfish, true sunfish, crayfish, and flagfish.
If you're going for a planted biotope, the easiest options are Amazon, South/Southeast Asian, and East/Central North American; fewer plants are available from other parts of the world. There are plenty of gorgeous community fish from each region.
The Amazon has tetras, hatchets, silver dollars, plecos, otos, cories, numerous other cats, etc.
Southeast Asia has rasboras, barbs, danios, gouramis, loaches, glassfish, and cats such as Mystus and glass cats.
North America has darters, shiners, dace, madtoms, mollies, killifish, pygmy sunfish, true sunfish, crayfish, and flagfish.